Area code 317 is a North American telephone area code assigned to Indianapolis, Indiana. First assigned in 1947 as one of the original 86 area codes in the North American Numbering Plan, 317 is among the oldest area codes in the country. It serves Indianapolis, Carmel, Fishers, Greenwood, Brownsburg, and most of central Indiana including Marion County and surrounding suburbs, and is a local (non-toll-free) area code in the Eastern Time Zone.